【摘要】：在中藥萃取過程中，加入超聲波對(duì)藥物進(jìn)行超聲作用，可有效提高中藥材的萃取量。受限于功率超聲設(shè)備輸出功率過小和超聲電源在工業(yè)現(xiàn)場(chǎng)使用不便的特點(diǎn)，功率超聲技術(shù)在中藥萃取領(lǐng)域的應(yīng)用一直都沒有規(guī)�；彤a(chǎn)業(yè)化。近幾年，隨著超聲換能器工藝的改進(jìn)和大功率數(shù)字式電源的出現(xiàn)，使功率超聲設(shè)備在中藥萃取領(lǐng)域的應(yīng)用成為可能。本文主要對(duì)大功率數(shù)字式超聲電源進(jìn)行一些研究，以期對(duì)實(shí)際工業(yè)應(yīng)用提供一定的幫助。 本文對(duì)功率超聲電源的匹配電路做了一些研究。舍棄了原有根據(jù)串聯(lián)諧振頻率Fs進(jìn)行靜態(tài)匹配的思路，采用新型動(dòng)態(tài)匹配方式，將換能器與匹配電路等效為一個(gè)整體，公式推導(dǎo)得到整體系統(tǒng)的動(dòng)態(tài)耦合頻率，超聲電源輸出頻率只需等于當(dāng)前系統(tǒng)耦合頻率，即可實(shí)現(xiàn)系統(tǒng)諧振。這為超聲數(shù)字電源進(jìn)行頻率自動(dòng)搜索和自動(dòng)跟蹤提供了理論依據(jù)。 本文設(shè)計(jì)了一套適合數(shù)字式超聲電源的控制算法。針對(duì)超聲電源所作用負(fù)載的特性，本文采用積分分離PI控制算法在頻率搜索階段和頻率跟蹤階段分別對(duì)通過換能器端的電流做恒流控制。在頻率控制方面，提出采用變步長(zhǎng)的方法進(jìn)行諧振頻率的搜索，針對(duì)負(fù)載變化程度的不同分別設(shè)計(jì)了相應(yīng)的頻率跟蹤算法，并最終提出適用于各種負(fù)載變化情況的通用頻率跟蹤算法。 本文所設(shè)計(jì)電源內(nèi)嵌Modbus_RTU通信協(xié)議，利用此協(xié)議可實(shí)現(xiàn)計(jì)算機(jī)對(duì)多臺(tái)超聲電源的遠(yuǎn)程集中設(shè)置。本文所設(shè)計(jì)的功率超聲設(shè)備已經(jīng)在河南宛西制藥廠的中藥萃取生產(chǎn)中得到應(yīng)用，結(jié)果表明，使用超聲設(shè)備后可使某些中藥材的出膏量較不使用超聲設(shè)備之前有較大的提高。因此，，功率超聲波技術(shù)在中藥萃取領(lǐng)域的規(guī)�；瘧�(yīng)用具有廣闊的前景。
[Abstract]:In the process of traditional Chinese medicine extraction, adding ultrasonic wave can effectively improve the extraction amount of traditional Chinese medicine. Limited by the characteristics that the output power of power ultrasonic equipment is too small and the ultrasonic power supply is inconvenient to be used in industrial field, the application of power ultrasonic technology in the field of traditional Chinese medicine extraction has not been large-scale and industrialized. In recent years, with the improvement of ultrasonic transducer technology and the emergence of high power digital power supply, the application of power ultrasonic equipment in the field of traditional Chinese medicine extraction has become possible. In this paper, some research on high power digital ultrasonic power supply is carried out in order to provide some help for practical industrial application. In this paper, the matching circuit of power ultrasonic power supply is studied. The dynamic coupling frequency of the whole system is obtained by using a new dynamic matching method, and the transducer and matching circuit are equivalent to a whole, and the dynamic coupling frequency of the whole system is derived by deducing the formula, which is based on the static matching method based on the series resonant frequency Fs. The output frequency of ultrasonic power supply only needs to be equal to the current system coupling frequency, and the system resonance can be realized. This provides a theoretical basis for automatic frequency search and automatic tracking of ultrasonic digital power supply. In this paper, a control algorithm suitable for digital ultrasonic power supply is designed. According to the characteristics of the load acting on the ultrasonic power supply, the integral separation Pi control algorithm is used to control the current passing through the transducer at the frequency searching stage and the frequency tracking stage, respectively. In the aspect of frequency control, the method of variable step size is proposed to search the resonant frequency, and the corresponding frequency tracking algorithms are designed according to the varying degree of load. Finally, a general frequency tracking algorithm suitable for various load variations is proposed. The Modbus_RTU communication protocol embedded in the power supply is designed in this paper, which can be used to realize the remote centralized setting of multiple ultrasonic power sources by computer. The power ultrasonic equipment designed in this paper has been used in the extraction production of traditional Chinese medicine in Henan Wanxi Pharmaceutical Factory. The results show that the quantity of extract of some traditional Chinese medicinal materials can be greatly increased after the use of ultrasonic equipment compared with that before the use of ultrasonic equipment. Therefore, the application of power ultrasonic technology in the field of traditional Chinese medicine extraction has a broad prospect.
【學(xué)位授予單位】：杭州電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB552

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